From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from simark.ca by simark.ca with LMTP id xcgJB/oyOGQL3SoAWB0awg (envelope-from ) for ; Thu, 13 Apr 2023 12:51:06 -0400 Received: by simark.ca (Postfix, from userid 112) id 07DA71E221; Thu, 13 Apr 2023 12:51:06 -0400 (EDT) Authentication-Results: simark.ca; dkim=pass (1024-bit key; secure) header.d=sourceware.org header.i=@sourceware.org header.a=rsa-sha256 header.s=default header.b=K2GPczEN; dkim-atps=neutral X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on simark.ca X-Spam-Level: X-Spam-Status: No, score=-4.3 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED, RDNS_DYNAMIC,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 Received: from sourceware.org (ip-8-43-85-97.sourceware.org [8.43.85.97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by simark.ca (Postfix) with ESMTPS id 7B5B61E0D3 for ; Thu, 13 Apr 2023 12:51:05 -0400 (EDT) Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 051E1385840A for ; Thu, 13 Apr 2023 16:51:04 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 051E1385840A DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1681404664; bh=MZGW5908WQIFK/g0E0qa8rS00qTWH/WImt4V53Uu06c=; h=Subject:In-Reply-To:Date:Cc:References:To:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From:Reply-To:From; b=K2GPczENH7bEHRvLcnbxx/Zd+nCOsQfPa+fAtEPeBy++vGSe1FqVCLtu89TmHhpod u4yxv6lRqTgUkaV02lL4bBED8OzCgCdOv2uoZ0TKKxTJSRSrYebw62hmVKlSvFGA1G D7hRFnoOaWR9Qdnu58ohrMXB7whBTS0gU0qIiX50= Received: from resqmta-a1p-077723.sys.comcast.net (resqmta-a1p-077723.sys.comcast.net [IPv6:2001:558:fd01:2bb4::9]) by sourceware.org (Postfix) with ESMTPS id 1F51C3858D39 for ; Thu, 13 Apr 2023 16:49:37 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 1F51C3858D39 Received: from resomta-a1p-076783.sys.comcast.net ([96.103.145.231]) by resqmta-a1p-077723.sys.comcast.net with ESMTP id mueopmgKyDaOen08dpACVU; Thu, 13 Apr 2023 16:49:35 +0000 Received: from smtpclient.apple ([IPv6:2601:191:200:f52:c8ec:4382:24ec:8e6c]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 256/256 bits) (Client did not present a certificate) by resomta-a1p-076783.sys.comcast.net with ESMTPSA id n08YpwSaEwHIJn08ZpLFCm; Thu, 13 Apr 2023 16:49:32 +0000 X-Xfinity-VMeta: sc=-100.00;st=legit Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3696.120.41.1.3\)) Subject: Re: RFC: Adding a SECURITY.md document to the Binutils In-Reply-To: Date: Thu, 13 Apr 2023 12:49:29 -0400 Cc: Richard Earnshaw , Nick Clifton , Binutils , "gdb@sourceware.org" Content-Transfer-Encoding: quoted-printable Message-Id: References: <1c38b926-e003-0e21-e7f1-3d5dbec2aabf@redhat.com> <5b147005-bd28-4cf9-b9e7-479ef02cb1ad@foss.arm.com> <5d044987-39eb-a060-1b2b-9d07b1515e7d@gotplt.org> <73bc480a-a927-2773-8756-50350f76dfbf@gotplt.org> <4ed86e65-0b7f-11d4-8061-2c5d0b1e147e@foss.arm.com> <7b6b10f8-e480-8efa-fbb8-4fc4bf2cf356@gotplt.org> <0224757b-6b17-f82d-c0bf-c36042489f5e@foss.arm.com> <01e846c0-c6bf-defe-0563-1ed6309b7038@gotplt.org> <2d4c7f13-8a35-3ce5-1f90-ce849a690e66@foss.arm.com> <01b8e177-abfd-549e-768f-1995cab5c81d@gotplt.org> To: Siddhesh Poyarekar X-Mailer: Apple Mail (2.3696.120.41.1.3) X-BeenThere: gdb@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gdb mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Paul Koning via Gdb Reply-To: Paul Koning Errors-To: gdb-bounces+public-inbox=simark.ca@sourceware.org Sender: "Gdb" > On Apr 13, 2023, at 12:02 PM, Siddhesh Poyarekar = wrote: >=20 > On 2023-04-13 11:08, Paul Koning wrote: >>> On Apr 13, 2023, at 11:02 AM, Siddhesh Poyarekar = wrote: >>>=20 >>> On 2023-04-13 10:50, Richard Earnshaw wrote: >>>> No, whilst elf can be executed, objdump should never be doing that: = it's a tool for examining a file, not running it. You have to have a = tool that can safely examine the contents of an elf file or you can = never verify it for issues - opening it up in emacs to examine the = contents is not the way to do that :) >>>=20 >>> You can verify it for issues, in a sandbox. >>>=20 >>>> But all that is beside the point. The original case I gave was a = /corrupt/ elf file that caused a buffer overrun in the objdump binary. >>>=20 >>> ... and that's a robustness issue. Any buffer overrun in any = program could in theory be exploited to send out files. >> No. Buffer overruns are generally recognized as security issues, = precisely because they (often) can be used to produce arbitrary code = execution exploits. >=20 > They're a common security exploit vector, but context matters. If you = have local access to a system, you can already execute arbitrary code; a = buffer overrun itself is not going to help you do anything that you = couldn't already do. By letting in an untrusted file or by accepting = inputs over a network, you're opening up a *new* vector to actually = exploit the buffer overflow to do something you couldn't already do. Yes, but... If someone sends me an executable file, and I execute it and suffer a = virus, shame on me. If someone sends me a C source file and I compile = and link that BUT DO NOT EXECUTE the resulting executable, and I suffer = a virus, shame on the tool. =20 I don't expect the act of compiling or linking or objdumping to = compromise my system's security, any more than I expect the act of = editing a text file to do so. The key point is expectation. I'm = reminded of a legal rule seen, for example, in "expectation of privacy": = I should assume I can be seen when walking around town, but it is valid = for me to assume I'm not seen when at home in my bathroom. Similarly, I = should assume my system can get attacked when I execute a program, but = it is reasonable for me to assume no attack is possible when I run gcc = or objdump (or hexdump or cat). paul